EP0037186A2 - Improved antifoam additives - Google Patents

Improved antifoam additives Download PDF

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Publication number
EP0037186A2
EP0037186A2 EP81300976A EP81300976A EP0037186A2 EP 0037186 A2 EP0037186 A2 EP 0037186A2 EP 81300976 A EP81300976 A EP 81300976A EP 81300976 A EP81300976 A EP 81300976A EP 0037186 A2 EP0037186 A2 EP 0037186A2
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EP
European Patent Office
Prior art keywords
composition
lubricating oil
molecular weight
benzene
antifoam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81300976A
Other languages
German (de)
French (fr)
Other versions
EP0037186A3 (en
EP0037186B1 (en
Inventor
Robert Tirtiaux
Alain Louis Pierre Lenack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Technology and Engineering Co
Original Assignee
Exxon Research and Engineering Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0037186A2 publication Critical patent/EP0037186A2/en
Publication of EP0037186A3 publication Critical patent/EP0037186A3/en
Application granted granted Critical
Publication of EP0037186B1 publication Critical patent/EP0037186B1/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M167/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M155/00—Lubricating compositions characterised by the additive being a macromolecular compound containing atoms of elements not provided for in groups C10M143/00 - C10M153/00
    • C10M155/02—Monomer containing silicon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/06—Well-defined aromatic compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/027—Neutral salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/028—Overbased salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbasedsulfonic acid salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2070/00—Specific manufacturing methods for lubricant compositions
    • C10N2070/02—Concentrating of additives

Definitions

  • the present invention relates to improvements in antifoam additives for lubricants and especially to improving the dispersion of the antifoam in a bulk lubricating oil as well as improving the effectiveness of the antifoamant.
  • Antifoam additives are incorporated into automotive crankcase lubricants to reduce the tendency of the oil to foam during operation of the engine.
  • the foaming tendency is enhanced by the presence of other additives such as surfactants especially the normal or highly basic metal sulphonates and phenates in the oil, such as the overbased calcium and magnesium sulphonate detergent additives.
  • Volatile solvents such as benzene, toluene or xylene have also been used as suitable media but these require distillation techniques to remove the solvent from the lubricating oil.
  • an improved silicone antifoam composition which is readily dispersable or miscible with lubricating oils which comprises a 1-10% by weight solution of a polydimethylsiloxane of the formula (CH 3 ) 3 Si(SiO(CH 3 ) 2 ) n O Si(CH 3 ) 3 where n is an integer to provide a viscosity of about 1000 to 60000 centistokes at 25°C in an alkyl aromatic hydrocarbon solvent being a mono-or polyalkylated benzene having a molecular weight of about 220 to 330 and a flash point greater than 140°C.
  • the silicone antifoam agents with which the present invention is concerned may be any of the well known silicones. Examples include those sold by Dow Corning under the trade name "Dow Corning 200 Fluid” - which are the fluid antifoam additives of the polymethylsiloxane type, in which the viscosity at 25°C can vary from 1000 to 60000 cSt, according to the polycondensation degree, may be used. Preferred is a viscosity range of about 10000 to 50000cSt.
  • Suitable alkyl aromatic solvents generally include mono- and polyalkylated benzene compounds which have a molecular weight of about 220 to 330 and a flash point (ASTM D92, Cleveland Open Cup) of about 140°C to 180°C.
  • the preferred solvents are polypropyl benzenes which distill between 290 and 330°C. These compounds are by-products of the manufacture of the heavy alkylates used in the production of detergents.
  • a particular preferred solvent is a polypropyl benzene of molecular weight 280 and a flash point of 140°C.
  • a polypropyl benzene of molecular weight 280 and a flash point of 140°C we find that if an alkyl aromatic of molecular weight above 330 is used then it is not possible to obtain a clear solution of the silicone. If however the alkyl aromatic has a flash point below 140°C it is necessary to distill off the solvent to retain the desirable properties of the lubricant. The flash point therefore should be between 140°C and 180°C.
  • the typical silicones are soluble in all proportions in the alkyl aromatic hydrocarbons but we prefer to dissolve from 2 to 8 weight per cent silicone in the solvent since this concentration allows accurate metering of the small quantities of antifoam needed in the bulk lubricant Generally from 0.005 to 0.5% of the antifoam based on the weight of the ' fully formulated lubricant composition is sufficient.
  • composition of the present invention also enables especially potent antifoaming formulations to be obtained.
  • a further embodiment of the present invention resides in lubricating oil compositions, especially lubricating oil compositions containing a metal detergent oil soluble normal or basic sulfonate or phenate additive, such as the calcium or magnesium sulfonates or phenates, which has reduced foaming tendencies through addition of 0.005 to 0.5% by weight of the polydimethylsiloxane antifoam agent said antifoam agent being added to the lubricating oil composition in the form of a 1 to 10% by weight solution in the alkyl aromatic hydrocarbon solvent being a mono- or polyalkylated benzene having a molecular weight of about 220 to 330 and a flash point greater than 140°C.
  • a metal detergent oil soluble normal or basic sulfonate or phenate additive such as the calcium or magnesium sulfonates or phenates
  • Such lubricating oil compositions will normally contain .
  • other conventional additives in such amounts as to provide their normal attendant functions such as dispersants, viscosity index improvers, anti-wear additives, antioxidants and the like in addition to the metal detergent additives noted above.
  • the present invention is illustrated but in no way limited by reference to the following Examples.
  • the foaming is measured on an oil of lubricating viscosity containing 2 wt % of a 300 Total Base Number Calcium Sulphonate according to the foam test ASTM D 892.
  • Metal detergent sulphonates are known to promote the foaming tendencies of lubricating oils and for that reason the test is conducted with oils containing sulphonates.
  • the antifoam agent was the silicone sold by Dow Corning under the trade name "DC200" having a 12500 cSt viscosity and various concentrations were incorporated in the lubricant by the following three techniques:

Abstract

Improved dispersion of silicon antifoams in lubricating compositions is achieved by dissolving the antifoam in an alkyl aromatic hydrocarbon of molecular weight below 330 and with a flash point above 140°C.

Description

  • The present invention relates to improvements in antifoam additives for lubricants and especially to improving the dispersion of the antifoam in a bulk lubricating oil as well as improving the effectiveness of the antifoamant.
  • Antifoam additives are incorporated into automotive crankcase lubricants to reduce the tendency of the oil to foam during operation of the engine. The foaming tendency is enhanced by the presence of other additives such as surfactants especially the normal or highly basic metal sulphonates and phenates in the oil, such as the overbased calcium and magnesium sulphonate detergent additives.
  • The use of silicone antifoam agents in lubricating oil compositions is well known in the art. Representative disclosures are US Patent 3,660,305 and issued May 2 1972 to Michalski; and US Patent 3,024,194 issued March 6 1962 to Francis et al and US Patent 2,813,077 issued November 12, 1977 to Rogers et al. The prior art recognises however that there are problems in providing effective dispersions or solutions of such silicone- antifoam agents in lubricating oils. Thus, US Patent 3,660,305 recommends combining silicone with an acetylenic alcohol to improve dispersability in oil. Beerbower et al in "Lubricating Engineering", June,11961, pages 282-285, show the desirability of providing high intensity mixing to stabilize the silicone in a lubricating oil. Volatile solvents such as benzene, toluene or xylene have also been used as suitable media but these require distillation techniques to remove the solvent from the lubricating oil.
  • In accordance with the present invention there is provided an improved silicone antifoam composition which is readily dispersable or miscible with lubricating oils which comprises a 1-10% by weight solution of a polydimethylsiloxane of the formula (CH3)3Si(SiO(CH3)2)n O Si(CH3)3 where n is an integer to provide a viscosity of about 1000 to 60000 centistokes at 25°C in an alkyl aromatic hydrocarbon solvent being a mono-or polyalkylated benzene having a molecular weight of about 220 to 330 and a flash point greater than 140°C.
  • The silicone antifoam agents with which the present invention is concerned may be any of the well known silicones. Examples include those sold by Dow Corning under the trade name "Dow Corning 200 Fluid" - which are the fluid antifoam additives of the polymethylsiloxane type, in which the viscosity at 25°C can vary from 1000 to 60000 cSt, according to the polycondensation degree, may be used. Preferred is a viscosity range of about 10000 to 50000cSt.
  • We have found that these silicones which are traditionally used as antifoamants for lubricants dissolve readily in the alkylaromatic solvents and that these solutions may be dispersed in bulk lubricating oil without impairing the performance of the lubricant. Suitable alkyl aromatic solvents generally include mono- and polyalkylated benzene compounds which have a molecular weight of about 220 to 330 and a flash point (ASTM D92, Cleveland Open Cup) of about 140°C to 180°C. The preferred solvents are polypropyl benzenes which distill between 290 and 330°C. These compounds are by-products of the manufacture of the heavy alkylates used in the production of detergents. A particular preferred solvent is a polypropyl benzene of molecular weight 280 and a flash point of 140°C. We find that if an alkyl aromatic of molecular weight above 330 is used then it is not possible to obtain a clear solution of the silicone. If however the alkyl aromatic has a flash point below 140°C it is necessary to distill off the solvent to retain the desirable properties of the lubricant. The flash point therefore should be between 140°C and 180°C.
  • The typical silicones are soluble in all proportions in the alkyl aromatic hydrocarbons but we prefer to dissolve from 2 to 8 weight per cent silicone in the solvent since this concentration allows accurate metering of the small quantities of antifoam needed in the bulk lubricant Generally from 0.005 to 0.5% of the antifoam based on the weight of the ' fully formulated lubricant composition is sufficient.
  • We have found that the use of the composition of the present invention also enables especially potent antifoaming formulations to be obtained.
  • Therefore a further embodiment of the present invention resides in lubricating oil compositions, especially lubricating oil compositions containing a metal detergent oil soluble normal or basic sulfonate or phenate additive, such as the calcium or magnesium sulfonates or phenates, which has reduced foaming tendencies through addition of 0.005 to 0.5% by weight of the polydimethylsiloxane antifoam agent said antifoam agent being added to the lubricating oil composition in the form of a 1 to 10% by weight solution in the alkyl aromatic hydrocarbon solvent being a mono- or polyalkylated benzene having a molecular weight of about 220 to 330 and a flash point greater than 140°C.
  • Such lubricating oil compositions will normally contain . other conventional additives in such amounts as to provide their normal attendant functions such as dispersants, viscosity index improvers, anti-wear additives, antioxidants and the like in addition to the metal detergent additives noted above.
  • The present invention is illustrated but in no way limited by reference to the following Examples. In these Examples the foaming is measured on an oil of lubricating viscosity containing 2 wt % of a 300 Total Base Number Calcium Sulphonate according to the foam test ASTM D 892. Metal detergent sulphonates are known to promote the foaming tendencies of lubricating oils and for that reason the test is conducted with oils containing sulphonates. The antifoam agent was the silicone sold by Dow Corning under the trade name "DC200" having a 12500 cSt viscosity and various concentrations were incorporated in the lubricant by the following three techniques:
    • (a) Dispersion directly in the oil under high shear conditions at 100°C for 30 minutes.
    • (b) The antifoam was dissolved to provide a clear stable solution by shaking at room temperature at a concentration of 4 wt per cent in polypropyl benzene of molecular weight 280, flash point 140°C, relative density at 15°C of 0.855 and a kinematic viscosity at 40°C of 8 cSt. This solution was readily miscible with lubricating oils.
    • (c) The antifoam was dissolved in toluene as per (b) but it was necessary to remove the toluene by distillation at 150°C.
  • The results which show foam height in ml, after 5 minutes and 10 minutes were as follows:
    Figure imgb0001
    The value without antifoam was 250/120.

Claims (7)

1. An improved silicone antifoam composition for lubricating oils which comprises a solution of a polydimethylsiloxane of the formula (CH3)3Si(sio(CH3)2)n 0 Si(CH3)3 wherein n is an integer to provide a viscosity of about 1000 to 60000 cSt in an alkylaromatic hydrocarbon solvent, said solvent being a mono- or polyalkylated benzene having a molecular weight of about 220 to 330 and a flash.point graded at 1400C, said composition exhibiting improved solubility in a lubricating oil composition.
2. The composition of Claim 1 wherein the alkyl aromatic hydrocarbon solvent is a polypropyl benzene.
3. The composition of Claim 2 wherein the polypropyl benzene has a molecular weight of about 280 and a flash point of about 140°C.
4. The composition of Claim 1 wherein the polydimethylsiloxane has a viscosity of about 10000 to 20000,.centistokes at 25°C.
5. The composition of Claim 1 wherein the concentration of said solution is about 2 to 10 weight per cent.
6. A lubricating oil with reduced foaming tendencies containing the composition of Claim 1.
7. The lubricating oil of Claim 6 which contains a metal detergent additive being a normal or basic calcium or magnesium sulfonate or phenate.
EP81300976A 1980-03-26 1981-03-09 Improved antifoam additives Expired EP0037186B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8010189 1980-03-26
GB8010189A GB2072691A (en) 1980-03-26 1980-03-26 Silicone antifoam solutions readily dispersible in lubricants

Publications (3)

Publication Number Publication Date
EP0037186A2 true EP0037186A2 (en) 1981-10-07
EP0037186A3 EP0037186A3 (en) 1981-12-23
EP0037186B1 EP0037186B1 (en) 1984-04-18

Family

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Family Applications (1)

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EP81300976A Expired EP0037186B1 (en) 1980-03-26 1981-03-09 Improved antifoam additives

Country Status (5)

Country Link
US (1) US4411806A (en)
EP (1) EP0037186B1 (en)
JP (1) JPS56158105A (en)
DE (1) DE3163153D1 (en)
GB (1) GB2072691A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234978A (en) * 1989-05-17 1991-02-20 British Petroleum Co Plc Fluorosilicone antifoam additive composition for use in crude oil separation
EP0529161A1 (en) * 1991-08-23 1993-03-03 Ethyl Petroleum Additives, Inc. Lubricants and functional fluids having enhanced foam-inhibiting properties

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938880A (en) * 1987-05-26 1990-07-03 Exxon Chemical Patents Inc. Process for preparing stable oleaginous compositions
US6348437B1 (en) * 1996-05-01 2002-02-19 Dow Corning Corporation Silicone oils with improved viscosity stability
US6090758A (en) * 1997-01-07 2000-07-18 Exxon Research And Engineering Co. Method for reducing foaming of lubricating oils
US5853617A (en) * 1997-05-14 1998-12-29 Gallagher; Christopher T. Method and composition for suppressing oil-based foams
GB2334529A (en) * 1998-02-23 1999-08-25 Lubrizol Corp Storage stable lubricant additive concentrate containing an antifoaming agent and methods of making the same
US7060662B2 (en) * 2002-02-14 2006-06-13 Afton Chemical Corporation Antifoam agent and method for use in automatic transmission fluid applications involving high pressure pumps
US7098173B2 (en) * 2002-11-19 2006-08-29 General Motors Corporation Thermally stable antifoam agent for use in automatic transmission fluids
US20040121921A1 (en) * 2002-12-20 2004-06-24 Calcut Brent D. Thermally stable antifoam agent and methods for use in functional fluids
US7056870B2 (en) * 2003-02-12 2006-06-06 General Motors Corporation Controlled release of antifoam additives from compounded rubber
US7087674B2 (en) 2003-02-12 2006-08-08 General Motors Corporation Controlled release of perfluoropolyether antifoam additives from compounded rubber
US20080167390A1 (en) * 2006-06-01 2008-07-10 James Archer Defoamer composition for suppressing oil-based and water-based foams
US7662757B2 (en) * 2006-06-27 2010-02-16 Exxonmobil Research And Engineering Company Stable defoamant composition containing GTL fluid and/or hydrodewaxate and/or hydroisomerized/catalytic (and/or solvent) dewaxed fluid as diluent
CN102974131B (en) * 2012-12-03 2015-03-04 华南师范大学 Special defoaming agent for secondary lead smelting flue gas desulfurization process and preparation method thereof
JP6088305B2 (en) * 2013-03-15 2017-03-01 出光興産株式会社 Antifoam composition, lubricating oil composition and method for producing the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972579A (en) * 1957-08-06 1961-02-21 Exxon Research Engineering Co Oil compositions having reduced foaming tendencies
US3024194A (en) * 1958-03-19 1962-03-06 Gulf Research Development Co Method of inhibiting foam in a lubricating oil composition
US3235502A (en) * 1962-06-11 1966-02-15 Socony Mobil Oil Co Inc Foam-inhibited oil compositions

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US2416504A (en) * 1945-01-03 1947-02-25 Gulf Research Development Co Prevention of foaming of hydrocarbon oils
US2813077A (en) * 1955-03-25 1957-11-12 Exxon Research Engineering Co Prevention of foaming in lubricants
US3660305A (en) * 1968-06-06 1972-05-02 Nalco Chemical Co Foam control in liquid hydrocarbons

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972579A (en) * 1957-08-06 1961-02-21 Exxon Research Engineering Co Oil compositions having reduced foaming tendencies
US3024194A (en) * 1958-03-19 1962-03-06 Gulf Research Development Co Method of inhibiting foam in a lubricating oil composition
US3235502A (en) * 1962-06-11 1966-02-15 Socony Mobil Oil Co Inc Foam-inhibited oil compositions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234978A (en) * 1989-05-17 1991-02-20 British Petroleum Co Plc Fluorosilicone antifoam additive composition for use in crude oil separation
GB2234978B (en) * 1989-05-17 1993-02-10 British Petroleum Co Plc Anti-foam additive
EP0529161A1 (en) * 1991-08-23 1993-03-03 Ethyl Petroleum Additives, Inc. Lubricants and functional fluids having enhanced foam-inhibiting properties

Also Published As

Publication number Publication date
JPH0131405B2 (en) 1989-06-26
JPS56158105A (en) 1981-12-05
DE3163153D1 (en) 1984-05-24
EP0037186A3 (en) 1981-12-23
GB2072691A (en) 1981-10-07
EP0037186B1 (en) 1984-04-18
US4411806A (en) 1983-10-25

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